Method of spinning and winding artificial silk filaments



April 13, 1937. H. G. VAN DER WAALS ,0

METHOD OF SPINNING AND WINDING ARTIFICIAL SILK FILAMENTS Filed Nov. 24,1935 l l'l dyestufis is stronger at. the exterior portions of ficialthread is increasingly more and more Patented Apr. 13, 1937 UNITEDSTATES 'METHOD OF SPINNING AND ARTIFICIAL SILK FILAMENTS HendrikGerardus van der Waals, Arnhem, Netherlands, assignor to American EnkaCorporation, a corporation of Delaware Application November 24, 1933,Serial No. 699,631 In Germany October 13, 1933 3 Claims. (01. iii-54 Thepresent invention concerns a new method of spinning and windingartificial silk filaments. More especially the invention has to do witha new and novel method for decreasing the diiference in the dyeingafiinity of artificial silk threads between the exterior and interiorportions of spun packages, such as threads wound on spinning spools orin cake form. I

One object of the present invention is to provide a method which willgive the threads running from the spinning nozzle to the collectingdevice, such as spool or spinning centrifuge, a certain amount ofstretch, and change the intensity of stretch from the beginning to'theend of the winding process. Another object of the present invention is amethod for giving theireshly spun thread on its way between the spinningnozzle and the colleeting device a predetermined stretch, increasing theamount of stretch from the beginning to the end of the winding processand providing means copper-process and the like it is known that thethread packages obtained, particularly bobbin packages, but also cakesproduced in the so called spinning centrifuges, show. variously strongthe bobbin packages and at the interior portions 'of the centrifugalpackagesl In order to compensate these various aflinities to dyestufisquite a numberof suggestions have been made, which,

however, havenot brought complete success.

According to the present invention it has been made possible to solvethis problem in a very efl'ective manner with new'means. According tothis a special positively'driven godet or drawwinding-m'ember. Thisdraws'ofi the thread as much as possible without slip .and delivers itto the winding member running at a certain, e. g., constant windingspeed. The important thing in the invention is that the ,drawing-ofispeed of the interposed godet is controlled during the winding processin sueha manner that the artistretched between the interposedgodet andthe real, positively driven winding member. In this way it isaccomplished that the exterior portions of the spinning'bobbinpackagesarelwound with threads with greater stretch than otherwise, and 1 theinterior portions of thespinning cake are also ing-ofi roller isinterposed in .front of the real constant during the winding process.

the winding process in such a way that a very extensive compensation inthe afiinity to dyestuffs is achieved. According to theinvention this isdone, in that during the winding the interposed positively drivendrawing-offroller or godet is made to run increasingly slower. This canbe accomplished with various means, which per se arealready known in theindustry, for I example by so-called 'conoid drives.

. For the better understanding of the invention attention is drawn tothe attached drawing representing three forms of execution of theinvention and the following description.

Fig. 1 shows diagrammatically the spinning arrangement for the so-calledspool-spinningprocess;

Fig.2 shows also the spinning arrangement for tional friction roller;

Fig. 3 shows the spinning arrangement for the centrifuge-process.

. the spool-spinning-process in using an -addi-,

According to Fig. 1 the thread rises from the spinning nozzle d situatedin the spinning bath on to the interposed, positively driven drawingoffroller R and from there it reaches via the transport roller r andthrough the traverse guide F the spinning bobbin S. The bobbin S isdrivenin a known manner in such a way-that the draw-- off speed of thethread remains approximately The positiveiy driven and slip-freeworkingdrawing-bfi roller R is driven in such a; way that it receives anincreasingly slower draw-off speed in the course of the winding process.

According to the arrangement represented in Fig. 2 the operations arefundamentally the same as in Fig. 1. The drawing-off roller, which isinterposed and driven positively and working at an increasinglydiminishing draw-01f speed, is a marked R1 in this case.

Between this drawing- I than the peripheral speed of the spinningbobbin,

whereby the thread can slip over the roller R2.

In Fig. 3 it is a matter of producing centrifugal artificial silk andthe positively driven winding member comprises the positively drivendelivery godet Ra, which per sevis always present, and the spinning potT. The prepositioned godet which is positively driven and works at anincreasingly diminishing transport speed during the. spinning process ishere marked R1.

Having now described my invention what I claim ist I 1. The process ofproducing artificial silk thread and the like of substantially uniformdenier and having improved dyeing properties which comprises extruding acelluiosic solution and passing the same through a setting bath,withdrawing the thus formed thread from the setting bath by passing thesame around a godet and thereby propelling the thread without glidingfriction, passing the thread in its path of travel to a bobbin overanother-godet operating at a peripheral speed greater than the linearspeed of the thread at that point so that a gliding contact occursbetween the thread and the second godet, collecting the thread at thebobbin at a greater linear speed than' the peripheral speed of the firstmentioned godet but at a lesser speed than the peripheral speed of thesecond mentioned godet, and-gradually decreasing the speed of the firstmentioned godet during the winding of the thread, whereby objectionablecharacteristics resulting from contraction are avoided.

2. The process of producing artificial silk thread and the like ofsubstantially uniform .denier and having improved dyeing propertieswhich,com-

aovaaoe prises extruding a cellulosic solution to form a thread, givingthe thread different linear speeds at predetermined spaced points in itspath of travel by passing the same after formation of the with theresultant increasing elongation of the threadwhile it is being wound onthe bobbin whereby objectionable characteristics. resulting fromcontraction are avoided.

3. The process of producing artificial silk thread and the likeof'substantially uniform denier and having improved dyeing propertieswhich comprises extruding a cellulosic solution into a spinning bath toform a thread, withdrawing the thread from the spinning bath by means ofa driven roller, passing the thread to a bobbin and collecting the samethereon at a substantially constant linear speed greater than theinitial linear speed of the draw-off roller'so as to stretch the thread,and during the spinning period imparting an increasingly slower draw-oi!speed to the roller whereby succeeding portions of the thread areincreasingly stretched as the thread is wound on the bobbin.

HENDRIK GERARDUS VAN DIR WAALS.

